When i crystallize a solution containing MgSO4+H2O to MgSO4.7H2O is the mole ratio 1:1? If so, then if i know that the no of mole of MgSO4/MgSO4.7H2O is 5 moles, then when i get the molar mass of MgSO4.7H2O will it be 24+32+16×4+7(16+2) meaning that i include the plus 7 in the H2O.